I was in Ambleside and on the Fairfield Horseshoe in mid January wearing my Scarpa 4 season boots for the 1st time in 12 months - they are definitely more work on the 1st day.
I was ok on day 2 but you've got a virtually rigid sole (crampon compatible) and additional weight so they hold your foot so tightly and differently, with no flex so against how you would walk in 3 season boots.
I happily put up with the difficult 1st day to know I can get crampons on when needed.